Hiiro no Koku: vol.1

Yuko Aketa, the beautiful wife living in this serene environment day by day, is one day victimized by several young men baring their way into her home. Yuko's trainer, Mr. Tao, is the man responsible for turning her into the bitch she is. As she left her husband and daughter, she set out to Mr. Tao's SM Club. She is into absurd figures as she surrenders herself to the men. What is still there after falling down the hill...